I have read on some web sites that there is a drive shaft adapter that is made so you can use a mustang drive shaft it is probably the same or close to the thunder bird shaft there is also a tranny conversion crossmember I have seen them for 135.00 I dont know how much the drive shaft adapter is I believe the adapter and a used mustang shaft is cheaper than having one made. I am going to put a c-4 in mine. it takes the same conversion parts. as far as the driveshaft adapter and drive shaft. I am just waiting for the c-3 to break